RFR: 8313403: Remove unused 'mask' field from JFormattedTextField

[Alexey Ivanov]

On Tue, 1 Aug 2023 03:46:31 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> It was left there since the JFormattedTextField class is Serializable, and it is a kind of "public" API because it is mentioned in the serializable form of this class(I think so). See an example where I had to add the spec to the private fields via CSR: https://bugs.openjdk.org/browse/JDK-8252544
> 
> But the JFormattedTextField is part of the Swing where we intentionally added a statement "Serialized objects of this class will not be compatible with future Swing releases" So we can delete it but probably CSR will be needed, I am not sure.

None of the Swing components is present in the [Serialized Form](https://docs.oracle.com/en/java/javase/17/docs/api/serialized-form.html) for Java 17.

However, the field is still part of a serialized object. If a CSR is required, it may not be worth the effort.

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PR Comment: https://git.openjdk.org/jdk/pull/15088#issuecomment-1660029391